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Interaction-driven ...
Interaction-driven first-order and higher-order topological superconductivity
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- Bonetti, Pietro M. (author)
- Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany.
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- Chakraborty, Debmalya (author)
- Uppsala universitet,Materialteori
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- Wu, Xianxin (author)
- Chinese Acad Sci, Inst Theoret Phys, Beijing, Peoples R China.
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- Schnyder, Andreas P. (author)
- Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany.;Kyoto Univ, Yukawa Inst Theoret Phys YITP, Kyoto 6068502, Japan.
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Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany Materialteori (creator_code:org_t)
- American Physical Society, 2024
- 2024
- English.
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In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 109:18
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Abstract
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- We investigate topological superconductivity in the Rashba-Hubbard model, describing heavy-atom superlattice and van der Waals materials with broken inversion. We focus in particular on fillings close to the van Hove singularities, where a large density of states enhances the superconducting transition temperature. To determine the topology of the superconducting gaps and to analyze the stability of their surface states in the presence of disorder and residual interactions, we employ an fRG+MFT approach, which combines the unbiased functional renormalization group (fRG) with a real-space mean-field theory (MFT). Our approach uncovers a cascade of topological superconducting states, including ?1 and ?1 pairings, whose wave functions are of dominant ?- and ?-wave character, respectively, as well as a time-reversal breaking ?1+??1 pairing. While the ?1 and ?1 states have first-order topology with helical and flat-band Majorana edge states, respectively, the ?1+??1 pairing exhibits second-order topology with Majorana corner modes. We investigate the disorder stability of the bulk superconducting states, analyze interaction-induced instabilities of the edge states, and discuss implications for experimental systems.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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